PYTHON log1p

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Python replacement for PHP's log1p [ edit | history ] 
import math
math.log1p(number) # Python 2.6+

PHP log1p

PHP original manual for log1p [ show | php.net ]

log1p

(PHP 4 >= 4.1.0, PHP 5)

log1p — Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero

Description

float log1p ( float $number )
Warning

This function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in a future release of PHP. This function should be used at your own risk.

log1p() returns log(1 + number ) computed in a way that is accurante even when the value of number is close to zero. log() might only return log(1) in this case due to lack of precision.

Parameters

number

The argument to process

Return Values

log(1 + number )

Changelog

Version Description
5.3.0 This function is now available on all platforms

See Also

  • expm1() - Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero
  • log() - Natural logarithm
  • log10() - Base-10 logarithm

Math Functions
PHP Manual